Machine for truing connecting-rod bearings



C. E. DAVIS.

MACHlNEfOR TRUING CONNECTING R00 BEARINGS. APPLICATION FILED AUILZB.I9Ia.

1,331,052. A Patented Feb. 17,1920.

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MACHINE FOR TBUING CONNECTING-BOD GS.

Specication of Letters Patent.

Patented Feb. 17, 1920.

Application led August 28, 1918. Serial No. 251,857.

To all whom t may concern:

Be it known that I, CECIL E. citizen of the United States, Montezuma, inthe county of Gray and State, of Kansas, have invented certain new anduseful Improvements in Machines for Truing Connecting-Rod Bearings, ofwhich the following is a specification.

My invention relates to a machine for cutting or truing the bearings ofconnecting rods or pitmen, of internal combustion engines, such asautomobile engines, while not necessarily restricted to this use.

important object of the invention is to provide a machine of the abovementioned character, adapted to true or cut the bear- DAvI's, a residingat in quickly and accurately and which is adjustable for coaction withconnecting rods or pitmen of different sizes.

'Other objects and advantages of the invention will be apparent durlngthe course of the following description. In the accompany' g drawings,forming a part of this specification and in which like numerals areemployed to designate like' parts throughout the same,

Figure 1 1s a side elevation of apparatus embodying my invention, partsbeing shown in central vertical longitudinal section,

Fig. 2 is a horizontal sectional view taken on line 2-2 of Fig. 1,

Fig. 3 is a transverse vertical sectional view taken on line 3-3 of Fig.1, and

Fig. 4 is a similar view taken on line 4 4 of Fig. 1.

In'the drawings, wherein for the purpose of illustration is shown apreferred embodiment of my invention, the numeral 5 desig nates a baseor support, rovided near one end with longitudinal anges or rails 6,spaced as shown. A slide 7 is mounted for lon itudinal adjustment uponthe flanges 6, an may be clamped thereto by a bolt 8, as shown.

The base 5 is provided near and spaced from its opposite end with atransverse rail or flange 9, upon which is mounted the two parts 10 of atransversely adjustable slide. These arts are adapted to bedrawntogether y a bolt 11, equipped with a thumb nut 12. The two partsare adapted to be clamped or locked to the transverse flange or rall 9,by a clamping bolt 13, as shown.

Arranged near the same end of the base 5, and outwardly of thetransverse flange 9, is a vertical opening 14, formed through anupstanding boss 15, as shown.

Arranged above the base 5 is an upper preferably horizontal support 16,which is similar in shape to the base 5 and provided between its endswith a pair of openings 17, receiving the reduced screw-threaded ends ofrods 18. These rods are vertically disposed and are rigidly secured tothe base 5, as shown at 19. The horizontal support 16 is clamped to theupper ends of the vertical rods 18 by nuts 20 or the like.l

The upper horizontal support 16 is provided centrally-thereof with alongitudinal opening or slot 21, within which is arranged the upperscrew-threaded end 22 of a longitudinally adjustable vertical shaft 23.This upper screw-threaded end carries a head 24, arranged upon the topof the support 16. The screw-threaded end is adapteckto slide within theopening or slot 21, and theshaft 23 may be clamped or locked to thesupport 16, by manipulation of a thumb nut 25,

carried by the screw-threaded portion 22, as

shown. The' lower end of the shaft 23 is screw-threaded, as shown at 26,for engagement with a clamping nut 27, engaging a washer 28 or the like.The longitudinally adjustable slide 7 is provided with an upwardlyextending member orl boss 29, which is tubular and has a longitudinalbore or opening 30. The boss 29 is externally screwthreaded, as shown at31, for engagement with a screw-threaded clamping element or nut 32, asshown. The shaft 23 has its lower screw-threaded end projecting into thebore 30, but has no screw-threaded engagement therein.

I provide a cutting or truing device, comprislng a verticallyscrew-threaded shaft 32', operating within a screw-threaded opening 33,formed in one end of the support 16. At its upper end, thescrew-threaded shaft 32 has a crank 34, rigidly secured thereto, forturning it. The lower end of the shaft 32 operates within the tubularboss 15, and is steadied and guided thereby. Near its lower end,'theshaft 32 is provided with a head 35, having a transverse opening, forthe reception of the shank of a cutter 36, this shank being clampedtherein Iby a bolt 37.

The numeral 38. designates a connectin rod or pitman rovided at itsforward en with a bearingead 39, receiving therein a bearing or bushing40, to be cut or trued.

At its opposite vend the connecting rod or pit-man 38 carries a sleeveor bearlng 4l, receiving the transverse pin of the plston, as is wellknown.

In the use of my apparatus, the slide 7 is longitudinally adjusted, inaccordance with the length of the connecting rod or piston 38, to beplaced in the machine. The pitman 38 is then arranged in the position,as shown in Figs. 1 and 2, with the forward portion thereof disposedwithin and between jaws 42, formed upon the parts 10. The sleeve 41 thenpasses over the screw-threaded boss 29, and contacts with the nut 32.The vertical shaft 23 is now brought to the position shown in Fig. 1,and the thumb nut 25 manipulates to clamp the same to the support 16.The clamping nut 2T is now turned whereby the sleeve 41 is securelyclamped between the nuts 27 and 32. The thumb nut 12 is now turned forclamping the forward portion of the 'pitman 38 between the parts 10.These several parts ,having been thus adjusted, the pitman is rigidlyheld against displacement, whereby the cutter 36 may be arranged withinthe bearing or bushing 40, as illustrated in Figs. 1 and 2. Upon turningthe screw-threaded cutter shaft 32', the cutter is rotated in contactwith the .bearing or bushing, and is also fed longitudinally thereof.After the bearingy has been cut or trued, the pit-man may be removedfrom the machine, by the reverse of the vabove operation.

It is to be understood that the form of my invention herewith shown anddescribed is to be taken as a preferred example of the same, and thatvarious changes in the shape, size, and arrangement of parts may beresorted to without departing from the spirit.

of my invention or the scope ofthe subjoined claims. Having thusdescribed my invention, I claim z- 1. The combination with a base, of asuport arranged above the same and extending longitudinally thereof,means to rigidly connect the support and base, an adjustable clampingdevice connected with the base and support and adapted to be adjustedlongitudinally thereof, said clamping device being adapted to hold thesleeve carried by on'e end of a connecting rod or pitman having abearing at the opposite end, a second clamping device connected with thebase and adapted to receive the pitman or connecting rod, and a cuttingelement connected with the support and adapted to operate within thebearing.

2. The combination with a base, of a suprt arranged above the same andvextending longitudinally thereof, means to rigidly connect the base andsupport, a slide mounted to move longitudinally of the base near one4end thereof, a clamping element carried by the slide, a shaft connectedwith the support and ada tudinally thereo a clamping element adjustablyconnected with the ,shaft and arranged to coact with the first namedclamping element, an adjustable clamping'device connected with the basenear the opposite end thereof, and a cutting device connected with thesupport and base and arranged nea-r the second named clamping device.

3. The combination with'a base having a support mounted thereabove, of aslide adjustable on said base and having a screw threaded member, aclamping element adjustably secured to said support and engaging thescrew threaded member, a coacting clamping element carried by saidmember, said clamping elements being adapted to engage and hold one endof a pitman, a device connected with the base and adapted to receive andhold the opposite end portion of the pitman, and a cutting elementconnected with the support and adapted to rotate within the bearing ofthe pitman.

4. The combination with a base, of a support arranged above andextending longitudinally of the base in approximately parallel relationthereto, means for connecting the sup rt and base, an adjustable clamp--ing device connected with the base and support and adapted to 'beadjusted longitudinally thereon, said clamping device being adapted toengage-with one end of a pitman, a second clamping device connected withthe base and Iadapted to engage with the opposite end portion ofthepitman, and a cuttin element adapted to operate within the bearing ofthe pitman.

5. An apparatus of the character described, as a sub-combination, abase, va support extending longitudinally of the base in approximatelyparallel relation thereto, said support being provided with 'alongitudinal openin meansto connect the support with the ase, asubstantially vertical shaft having its lower end screw threaded and itsupper end extending into the longitudinal opening of the support, meansto clamp the upper end of the shaft to the sup-l port, a clampingelement having screw threaded engagement with the lower screw threadedend of the shaft, a slide longitudinally adjustably mounted upon thebase and provided with a tubular extension receiving the lower end ofthe shaft and being exteriorly screw threaded, and a coacting clampingelement engaging the exteriorly screw threaded tubular extension.

In testimony whereof I aiix my signature in presence of two witnesses.

, CECIL E. DAVIS.

Witnesses:

ALFRED J. CLARK, RUSSELL MONNENGAN.

ted to be' adjusted lcngi-

